No bake chocolate biscuit cake

Now I don’t have a sweet tooth, nor am I the world’s biggest
fan of chocolate, but this recipe was a big favourite of mine growing up. It was
also one of the few recipes where my mother would actually let me help. I used
to get to stir the chocolate sauce and crumble the biscuits in. The biscuits
used in this recipe are called Marietta or in some countries they are called
Marie (it’s the brand name here in the Netherlands). I've no idea where this recipe came from other than it's one my mother learned at school in Ireland about 60 or so years ago.

In a saucepan melt the butter and sugar together on a
medium heat until the sugar has dissolved
Lower the heat, add the cocoa powder
and then stir through the eggs, Stir for 2-3 mins to cook out the eggs, ensure to keep the
temperature low as you do not want the egg mixture to scramble
Add the broken biscuits and ensure the chocolate mixture coats all the biscuits
Transfer to a baking tray and push the mixture down ensuring it is nicely
compacted
Place in the fridge and allow to set for 4-6 hours